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sctp: add support for dscp and flowlabel per transport

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Like some other per transport params, flowlabel and dscp are added
in transport, asoc and sctp_sock. By default, transport sets its
value from asoc's, and asoc does it from sctp_sock. flowlabel
only works for ipv6 transport.

Other than that they need to be passed down in sctp_xmit, flow4/6
also needs to set them before looking up route in get_dst.

Note that it uses '& 0x100000' to check if flowlabel is set and
'& 0x1' (tos 1st bit is unused) to check if dscp is set by users,
so that they could be set to 0 by sockopt in next patch.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2018-07-02 18:21:12 +08:00 committed by David S. Miller
parent 69b9e1e07d
commit 8a9c58d28d
5 changed files with 44 additions and 6 deletions
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7
include/linux/sctp.h
View File

@ -801,4 +801,11 @@ struct sctp_strreset_resptsn {
__be32 receivers_next_tsn;
};
enum {
SCTP_DSCP_SET_MASK = 0x1,
SCTP_DSCP_VAL_MASK = 0xfc,
SCTP_FLOWLABEL_SET_MASK = 0x100000,
SCTP_FLOWLABEL_VAL_MASK = 0xfffff
};
#endif /* __LINUX_SCTP_H__ */

9
include/net/sctp/structs.h
View File

@ -193,6 +193,9 @@ struct sctp_sock {
/* This is the max_retrans value for new associations. */
__u16 pathmaxrxt;
__u32 flowlabel;
__u8 dscp;
/* The initial Path MTU to use for new associations. */
__u32 pathmtu;
@ -895,6 +898,9 @@ struct sctp_transport {
*/
__u16 pathmaxrxt;
__u32 flowlabel;
__u8 dscp;
/* This is the partially failed retrans value for the transport
* and will be initialized from the assocs value. This can be changed
* using the SCTP_PEER_ADDR_THLDS socket option
@ -1772,6 +1778,9 @@ struct sctp_association {
*/
__u16 pathmaxrxt;
__u32 flowlabel;
__u8 dscp;
/* Flag that path mtu update is pending */
__u8 pmtu_pending;

7
net/sctp/associola.c
View File

@ -115,6 +115,9 @@ static struct sctp_association *sctp_association_init(
/* Initialize path max retrans value. */
asoc->pathmaxrxt = sp->pathmaxrxt;
asoc->flowlabel = sp->flowlabel;
asoc->dscp = sp->dscp;
/* Initialize default path MTU. */
asoc->pathmtu = sp->pathmtu;
@ -647,6 +650,10 @@ struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc,
peer->sackdelay = asoc->sackdelay;
peer->sackfreq = asoc->sackfreq;
if (addr->sa.sa_family == AF_INET6)
peer->flowlabel = asoc->flowlabel;
peer->dscp = asoc->dscp;
/* Enable/disable heartbeat, SACK delay, and path MTU discovery
* based on association setting.
*/

11
net/sctp/ipv6.c
View File

@ -209,12 +209,17 @@ static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport)
struct sock *sk = skb->sk;
struct ipv6_pinfo *np = inet6_sk(sk);
struct flowi6 *fl6 = &transport->fl.u.ip6;
__u8 tclass = np->tclass;
int res;
pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", __func__, skb,
skb->len, &fl6->saddr, &fl6->daddr);
IP6_ECN_flow_xmit(sk, fl6->flowlabel);
if (transport->dscp & SCTP_DSCP_SET_MASK)
tclass = transport->dscp & SCTP_DSCP_VAL_MASK;
if (INET_ECN_is_capable(tclass))
IP6_ECN_flow_xmit(sk, fl6->flowlabel);
if (!(transport->param_flags & SPP_PMTUD_ENABLE))
skb->ignore_df = 1;
@ -223,7 +228,7 @@ static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport)
rcu_read_lock();
res = ip6_xmit(sk, skb, fl6, sk->sk_mark, rcu_dereference(np->opt),
np->tclass);
tclass);
rcu_read_unlock();
return res;
}
@ -254,6 +259,8 @@ static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
fl6->flowi6_oif = daddr->v6.sin6_scope_id;
else if (asoc)
fl6->flowi6_oif = asoc->base.sk->sk_bound_dev_if;
if (t->flowlabel & SCTP_FLOWLABEL_SET_MASK)
fl6->flowlabel = htonl(t->flowlabel & SCTP_FLOWLABEL_VAL_MASK);
pr_debug("%s: dst=%pI6 ", __func__, &fl6->daddr);

16
net/sctp/protocol.c
View File

@ -426,13 +426,16 @@ static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
struct dst_entry *dst = NULL;
union sctp_addr *daddr = &t->ipaddr;
union sctp_addr dst_saddr;
__u8 tos = inet_sk(sk)->tos;
if (t->dscp & SCTP_DSCP_SET_MASK)
tos = t->dscp & SCTP_DSCP_VAL_MASK;
memset(fl4, 0x0, sizeof(struct flowi4));
fl4->daddr = daddr->v4.sin_addr.s_addr;
fl4->fl4_dport = daddr->v4.sin_port;
fl4->flowi4_proto = IPPROTO_SCTP;
if (asoc) {
fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk);
fl4->flowi4_tos = RT_CONN_FLAGS_TOS(asoc->base.sk, tos);
fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
fl4->fl4_sport = htons(asoc->base.bind_addr.port);
}
@ -495,7 +498,7 @@ static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
fl4->fl4_sport = laddr->a.v4.sin_port;
flowi4_update_output(fl4,
asoc->base.sk->sk_bound_dev_if,
RT_CONN_FLAGS(asoc->base.sk),
RT_CONN_FLAGS_TOS(asoc->base.sk, tos),
daddr->v4.sin_addr.s_addr,
laddr->a.v4.sin_addr.s_addr);
@ -971,16 +974,21 @@ static inline int sctp_v4_xmit(struct sk_buff *skb,
struct sctp_transport *transport)
{
struct inet_sock *inet = inet_sk(skb->sk);
__u8 dscp = inet->tos;
pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb,
skb->len, &transport->fl.u.ip4.saddr, &transport->fl.u.ip4.daddr);
skb->len, &transport->fl.u.ip4.saddr,
&transport->fl.u.ip4.daddr);
if (transport->dscp & SCTP_DSCP_SET_MASK)
dscp = transport->dscp & SCTP_DSCP_VAL_MASK;
inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS);
return ip_queue_xmit(&inet->sk, skb, &transport->fl);
return __ip_queue_xmit(&inet->sk, skb, &transport->fl, dscp);
}
static struct sctp_af sctp_af_inet;